Why Do iPhone Duo Apps Have Black Bars? (And What You Can Do)
Instagram, banking apps and games often don't fill the iPhone Duo's inner screen yet. Why that happens, when it'll get better, and how to live with it.
You unfold your new iPhone Duo, open a favourite app, and it sits in the middle of the screen with black bars around it. It's one of the first things people notice, and it's annoying on a $1,999 phone.
Why it happens
The Duo's inner screen is a shape iPhone apps have never had to deal with before. Until a developer updates an app for it, iOS runs the app in a compatibility mode: it keeps the app's normal iPhone shape and fills the rest with black.
Reviewers and owners say a lot of popular apps are still like this, including social media, banking, games and productivity apps.
Even Apple's own apps aren't perfect yet. Safari leaves unused space at the bottom and right side, so you can see less of a page than you'd expect.
Is it getting better?
Yes, and quickly. Apple says developers are rapidly updating apps for the foldable. Some developers are already stretching their apps to fill more of the screen while they build proper versions.
Big apps usually move fastest. Small apps, banking apps and older games can take months.
What you can do now
Keep apps updated
App Store → your profile picture → Update All. Turn on automatic updates: Settings → Apps → App Store → App Updates. An app can go from letterboxed to full screen overnight.
Use the website instead
For apps that are still boxed in, the website in Safari often looks better on the big screen. This works well for shopping, news and many banking sites.
Use the outer screen for unoptimised apps
If an app looks bad unfolded, close the phone and use it on the outer screen, where it fits normally.
Tell the developer
Most apps have a feedback or support option. Developers pay attention when lots of Duo owners ask.
Other software quirks to know about
iOS 27.2 is out, but owners and developers still report a few rough edges on the Duo:
- Camera orientation can be wrong in some apps
- Accidental touches near the edges when holding it open
- Dynamic Island and Live Activities can look odd in some apps
These are software problems, so expect fixes in future updates. Keep the phone on the latest version: Settings → General → Software Update.
If black bars are a deal-breaker for you, the iPad mini has a much bigger library of apps built for its screen.